That would help retrieve documents based on their contents. But you couldn’t query by a description of what kind of link it is. So metaphor is able to translat

That would help retrieve documents based on their contents. But you couldn’t query by a description of what kind of link it is. So metaphor is able to translate the language of comments (“here are some thoughtful, technical blog posts about AI”) to the language of documents. Disclaimer: I also work on a semantic search engine.